Hi dear! If you have regular period cycles, you may have more chances to be pregnant after missing a period. But some times, periods may delay because of stress, low blood levels, etc. Most of the times pregnancy test kits give accurate results. They may fail in some situations too. So, you just repeat test with new kit or you can just opt for blood or HCG test which gives you accurate result.

Dear... almost all pregnancy test kits which are available in market are with 99% accuracy. They give the procedure in leaflets. Read them carefully. Test with kit 8 or 15 days after missing your period. Always test with morning samples.